Electronics Letters is an internationally renowned peer-reviewed rapid-communication journal that
publishes short original research papers every two weeks. Its broad and interdisciplinary scope covers the latest
developments in all electronic engineering related fields including communication, biomedical, optical and device
technologies. Electronics Letters also provides further insight into some of the latest developments
through special features and interviews.

A wideband low-profile slot-loop antenna is proposed based on an artificial magnetic conductor (AMC) reflector which is applied to a slot-loop antenna to obtain directional radiation patterns. Compared with an antenna using a metal reflector, the AMC reflector can reduce the profile of the antenna and enhance operating bandwidth. The AMC consists of 4 × 6 patches with ring slots and slits. A coplanar waveguide is introduced to the proposed slot-loop antenna so that the antenna can directly attach to the AMC surface. Thus, a low profile of 0.05λL is realised (λL is the wavelength at the lowest operating frequency). Simulation and experimental results indicate that the proposed antenna obtained a 37.9% impedance bandwidth, a 36.7% 3-dB gain bandwidth, and a 6.85 dBi peak gain.

A microstrip patch antenna with circular polarisation is presented by using an intrinsically asymmetric 3D-printed substrate. Unlike conventional circularly polarised (CP) antenna, the perturbation for generating CP waves is caused by the asymmetry of substrate, where a pair of triangular air insertions is symmetrically etched in one of diagonals of the square substrate. Besides, a slot is etched on the centre of patch and parallel to its side for good impedance matching. Actually, in consideration of the fact that in 3D printing, the dimensional tolerance for dielectric is less than the one for metal, the presented approach has more superiority than the conventional methods. A prototype is fabricated and measured. Measured results are found in reasonably good agreement with the simulated ones. Stereo lithography apparatus technology is here employed in the 3D printing process.

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Interview with Mario A de Oliveira

Mario A de Oliveira from Mato Grosso Federal Institute of Technology, Brazil, talks to Electronics Letters about his paper ‘Embedded application of convolutional neural networks on Raspberry Pi for SHM’. Read more...

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Guillaume Ducournau from the Institute of Electronics, Microelectronics and Nanotechnology (IEMN) at the University of Lille, France, talks to Electronics Letters about his paper ‘Single channel 100 Gbit/s transmission using III–V UTC-PD photodiodes for future IEEE 802.15.3d wireless links in the 300 GHz band’. Read more...

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